As genuine advice, if a girl is really cool, you like hanging out, talking with her is easy, and sometimes she lets you make out with her, but she hasn't said anything about monogamy (or poly)...

When she offers to come to your house and water your plants when you are gone and you say yes, You just agreed to monogamy, If she sees used condom wrappers on the floor expect some dead plants when you get back.

But yeah, you're right- If you agree to let a woman enter your apt and feed your fish (which, incidentally... is an odd suggestion if it were in real life...), I suppose you could assume she expects a little more.

The thing is, there was no conversation path whatsoever (like there is when trying to romance 2 other people) forcing you to choose. If word travels fast around a ship, nobody else was protesting my boot knocking episode with Kelly when I wanted to romance Jack or Miranda.